<template>
  <div>
    <!-- 评论列表 -->
    <div class="cmt-list">
      <!-- 评论的 Item 项 -->
      <div class="cmt-item" v-for="item in commentList" :key="item.com_id">
        <!-- 头部区域 -->
        <div class="cmt-header">
          <!-- 头部左侧 -->
          <div class="cmt-header-left">
            <img :src="item.aut_photo" alt="avatar" class="avatar" />
            <span class="uname">{{ item.aut_name }}</span>
          </div>
          <!-- 头部右侧 -->
          <div class="cmt-header-right">
            <van-icon
              v-if="item.is_liking"
              name="like"
              size="16"
              color="red"
              @click="likeCommentFn(item)"
            />
            <van-icon
              v-else
              name="like-o"
              size="16"
              color="gray"
              @click="likeCommentFn(item)"
            />
          </div>
        </div>
        <!-- 主体区域 -->
        <div class="cmt-body" v-html="item.content"></div>
        <!-- 尾部区域 -->
        <div class="cmt-footer">{{ formTimeAgoFn(item.pubdate) }}</div>
      </div>
    </div>
    <!-- 底部添加评论区域 - 1 -->
    <div v-if="showCmtTop" class="add-cmt-box van-hairline--top">
      <van-icon name="arrow-left" size="0.48rem" @click="$router.back()" />
      <div class="ipt-cmt-div" @click="showCmtTop = false">发表评论</div>
      <div class="icon-box">
        <!-- native: 让组件也支持点击事件 -->
        <van-badge :content="totalCount" :max="99" @click.native="scrollViewFn">
          <van-icon name="comment-o" size="0.53333334rem" />
        </van-badge>
        <van-icon name="star-o" size="0.53333334rem" />
        <van-icon name="share-o" size="0.53333334rem" />
      </div>
    </div>

    <!-- 底部添加评论区域 - 2 -->
    <div v-else class="cmt-box van-hairline--top">
      <textarea
        v-model.trim="cmtStr"
        placeholder="友善评论、理性发言、阳光心灵"
        v-jujiao
        @blur="showCmtTop = true"
        @keydown.enter="publishCmtFn"
      ></textarea>
      <van-button type="default" @click="publishCmtFn" :disabled="!cmtStr"
        >发布</van-button
      >
    </div>
  </div>
</template>

<script>
import {
  getCommentAPI,
  likeCommentAPI,
  dislikeCommentAPI,
  publishCmtAPI,
} from "@/api/article";
import { Toast } from "vant";
export default {
  name: "comment",
  // 存放响应式数据
  data() {
    return {
      commentList: [], // 评论列表
      showCmtTop: true, // 控制评论两套标签的互斥显示，true表示上面可见，false表示上面不可见
      totalCount: 0, // 评论总数
      cmtStr: "", // 评论内容
    };
  },
  props: {
    artId: {
      type: String,
      required: true,
    },
  },
  async created() {
    const resp = await getCommentAPI({
      artId: this.artId,
    });
    // console.log(resp);
    const { results, total_count: totalCount } = resp.data;
    this.commentList = results;
    this.totalCount = totalCount;
  },
  methods: {
    // 点赞和取消点赞
    async likeCommentFn(item) {
      // 1. 同步到后台
      try {
        item.is_liking
          ? await dislikeCommentAPI({
              cmtId: item.com_id,
            })
          : await likeCommentAPI({
              cmtId: item.com_id,
            });

        Toast.success(item.is_liking ? "取消点赞成功" : "点赞成功");
        // 2. 改vue数据变量 is_liking取反
        item.is_liking = !item.is_liking;
      } catch (e) {
        Toast.fail(item.is_liking ? "取消点赞失败" : "点赞失败");
      }
    },
    scrollViewFn() {
      document.getElementById("like-box").scrollIntoView({
        behavior: "smooth",
      });
    },
    async publishCmtFn() {
      // 1. 同步到后台
      const resp = await publishCmtAPI({
        artId: this.artId,
        data: this.cmtStr,
      });
      //   console.log(resp);
      // 2. 把评论内容添加到 commentList 数组的头部
      this.commentList.unshift(resp.data.new_obj);

      // 评论发布完，清空输入内容
      this.cmtStr = "";
    },
  },
};
</script>

<style scoped lang="less">
.cmt-list {
  padding: 10px;
  .cmt-item {
    padding: 15px 0;
    + .cmt-item {
      border-top: 1px solid #f8f8f8;
    }
    .cmt-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      .cmt-header-left {
        display: flex;
        align-items: center;
        .avatar {
          width: 40px;
          height: 40px;
          background-color: #f8f8f8;
          border-radius: 50%;
          margin-right: 15px;
        }
        .uname {
          font-size: 12px;
        }
      }
    }
    .cmt-body {
      font-size: 14px;
      line-height: 28px;
      text-indent: 2em;
      margin-top: 6px;
      word-break: break-all;
    }
    .cmt-footer {
      font-size: 12px;
      color: gray;
      margin-top: 10px;
    }
  }
}
/*美化 - 文章详情 - 底部的评论页面 */
// 外层容器
.art-cmt-container-1 {
  padding-bottom: 46px;
}
.art-cmt-container-2 {
  padding-bottom: 80px;
}

// 发布评论的盒子 - 1
.add-cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  line-height: 46px;
  padding-left: 10px;
  .ipt-cmt-div {
    flex: 1;
    border: 1px solid #efefef;
    border-radius: 15px;
    height: 30px;
    font-size: 12px;
    line-height: 30px;
    padding-left: 15px;
    margin-left: 10px;
    background-color: #f8f8f8;
  }
  .icon-box {
    width: 40%;
    display: flex;
    justify-content: space-evenly;
    line-height: 0;
  }
}

.child {
  width: 20px;
  height: 20px;
  background: #f2f3f5;
}

// 发布评论的盒子 - 2
.cmt-box {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding-left: 10px;
  box-sizing: border-box;
  background-color: white;
  textarea {
    flex: 1;
    height: 66%;
    border: 1px solid #efefef;
    background-color: #f8f8f8;
    resize: none;
    border-radius: 6px;
    padding: 5px;
  }
  .van-button {
    height: 100%;
    border: none;
  }
}
</style>